This isn't a store. There are no products,
and hence no pictures of products. In general,
there's nothing that you can't see now that you
can see with an account - so if you're just reading,
you don't need an account.

Getting an account doesn't help you with that.
Check in the person's user page (click on their name)
for an e-mail address. If you don't see one, the poster
either doesn't want to be privately contacted or forgot
to publish their e-mail address.

Sorry, you're at the wrong address. The halfbakery
doesn't perform online marriages. (In general, there's
no such thing, although there are places which will perform
legally meaningless ceremonies for money.)

Sorry, you're at the wrong address.
This site is not a store or service.
It's just a place to talk about ideas for inventions.
Some of them have to do with tracking people; others involve
robotic road cones.

Nothing. The halfbakery software doesn't use e-mail. But
you need to contact the human maintainer in some
way, and email is a reasonable asynchronous text
medium. It's fine to use one-off or short-lived addresses;
you'll get one reply, and that's it.

Sorry, but you're not for us.
This site is a place where normal people talk about
silly ideas that don't exist yet. It's not a marketing
device, and if you ignore that, and get an account,
and use it to publicise your very real invention, you
will make a lot of people angry at you or
your company, and will lose your account.

Nobody's stealing anything. This is not a store.
If you're commercially producing something that one
of the halfbakery users has thought of independently,
good for you. Get an account and annotate the halfbakery
posting with a pointer to your real product. (Not
all of them. The one that's actually relevant.)

If you don't want to get yet another stupid account
somewhere, that's fine. Just send e-mail saying
"Hey, I'm selling this!" with a link to your site,
and the website's owner will annotate the idea in
question for you. We're that nice.